I just finished to tweak an amp closed to the Fender and Alessandro design with an effects loop.
You can find some views here and there.
Clic here for some samples :
Sample 1
Sample 2
Sample 3
The "Blue Bossa" Theme
You can find some interesting design on this amp.
I introduce a circuit to empty the capacitors of dangerous hight voltage after turn off the amp, about thirty seconds content to have almost no residual voltage.
You can also find an interesting filtering design by L/C, on the High Voltage source with a "non-center tap" transformer and silicium rectifier bridge. This helps the amp to be more quiet and give a better stability of the voltage value at high volume and so give a better dynamic.
The effects loop is totaly parallel, very inspired by the reverb design of the BF Fender amps. It have the less influence as possible on the signal way and so is the more transparent than possible. It work very well with a TC G-Major-that's what you can hear on the samples.
The amp is totaly class A with two 6V6 tubes and have a power of 10W very useful.
I use to play it in clubs and rehearsal with my differents groups and never feel it weak !
You can find all about it here.
It's in french but if you have any questions I'll try to answer the better I can.
To help you :
Calculs want to mean Maths
Lampes want to mean Vacuum Tubes
Schéma is for schematic
Déphaseur is for Phase Inverter.
You can find more samples below the page of my article. (DEMO)
Plenty informations are available.
Schematics, mesurements, Maths, components ...
